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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dc3a20003a1edfa0f43264d3817ef8dda188aaeb3732739f4a7d55848fd6c8' 
  AND token = '7hxyejLMtJh8UKinn1lttTrdj4d/9dJ1Vca49HUDq9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}